They are extremely high interrupting rating fuses: 440 VDC, with a large band of ratings (from 50 A to 100 A).
High-Speed Cylindrical Fuse Protistor® Size 22x58 gLB 440VDC IEC 100A With Striker
High-Speed Cylindrical Fuse Protistor® Size 27x60 gLB 440VDC IEC 125A With Striker
High-Speed Cylindrical Fuse Protistor® Size 27x60 gR (gRB) 660VDC IEC 0.8A With Striker
High-Speed Cylindrical Fuse Protistor® Size 36x400 gR (gRC) 4000VDC IEC 0.8A
High-Speed Cylindrical Fuse Protistor® Size 14x51 gR 690VAC IEC 1A